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Make URLRouter in options conditional on generic

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URLRouter can be passed in option to vm only if the SegmentType used
contains session.
ViewModel.urlCreator returns undefined when used with a SegmentType that
lacks session.
This commit is contained in:
RMidhunSuresh 2022-03-03 20:17:15 +05:30
parent a336623f3a
commit ec1cc89cf9
1 changed files with 10 additions and 6 deletions
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16
src/domain/ViewModel.ts
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@ -30,15 +30,17 @@ import type {Navigation} from "./navigation/Navigation";
import type {SegmentType} from "./navigation/index";
import type {URLRouter} from "./navigation/URLRouter";
type Options<N extends {session: string}> = {
type OptionsWithoutUrlCreator<N extends object> = {
platform: Platform
logger: ILogger
urlCreator: URLRouter<N>
navigation: Navigation<N>
emitChange?: (params: any) => void
}
type OptionsWithUrlCreator<N extends { session: string }> = OptionsWithoutUrlCreator<N> & {urlCreator: URLRouter<N>};
export class ViewModel<N extends {session: string} = SegmentType, O extends Options<N> = Options<N>> extends EventEmitter<{change: never}> {
type Options<N extends object> = N extends { session: string } ? OptionsWithUrlCreator<N> : OptionsWithoutUrlCreator<N>;
export class ViewModel<N extends object = SegmentType, O extends Options<N> = Options<N>> extends EventEmitter<{change: never}> {
private disposables?: Disposables;
private _isDisposed = false;
private _options: Readonly<O>;
@ -136,11 +138,13 @@ export class ViewModel<N extends {session: string} = SegmentType, O extends Opti
return this.platform.logger;
}
get urlCreator(): URLRouter<N> {
return this._options.urlCreator;
get urlCreator(): N extends { session: string }? URLRouter<N>: undefined {
// typescript needs a little help here
return (this._options as unknown as {urlCreator: any}).urlCreator;
}
get navigation(): Navigation<N> {
return this._options.navigation;
// typescript needs a little help here
return this._options.navigation as unknown as Navigation<N>;
}
}